Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad90c6214c50bf06…

MALICIOUS

PDF

81.0 KB Created: 2021-03-04 23:39:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9922dbc4ed148c831038b3a2c8a62068 SHA-1: 80b452945ae45b8e7decc7d11be9d0aeb862c8fc SHA-256: ad90c6214c50bf06ce0042670103d1f3589f190eebfd1e4a138e61dc9270225b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, with at least one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to software libraries. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/wb?keyword=omnisphere%202%20library%20size PDF link annotation
    • http://organize.shop/rational_vs_irrational_worksheetijvae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470526/normal_5fe264d6ee56f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450624/normal_60151ed07d924.pdfIn PDF document text
    • https://vedixoba.weebly.com/uploads/1/3/4/8/134864822/6012074.pdfIn PDF document text
    • https://lobobofu.weebly.com/uploads/1/3/4/6/134680821/wumorovewisofapevu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376629/normal_5fce90bf9dce8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410447/normal_5fdb983af07ff.pdfIn PDF document text
    • http://drilltech.info/britney_spears_mp3_songs_free_download9piss.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402706/normal_600a1d51abeb5.pdfIn PDF document text
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/2147834.pdfIn PDF document text
    • http://ig-socialmedia.xyz/145723256943jmjn.pdfIn PDF document text
    • https://padobijitoxu.weebly.com/uploads/1/3/1/0/131070591/wefefijenanuzik.pdfIn PDF document text
    • http://luminar4-download.xyz/legacy_of_the_dragonborn_patch5ond4.pdfIn PDF document text
    • https://rutesusu.weebly.com/uploads/1/3/0/7/130776221/gogiwusan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf23f1bb-9fc8-4e73-b859-238a7ec80d3a/dell_v313_driver_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/holy_quran_yusuf_ali_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b170d9-970c-4dd9-a929-37f4aec2b77b/mofafaloxinugow.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/runejanenudurozomumijiwem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a637f0c0-24e7-4c9c-8824-bb4b3c337367/permutations_worksheet_with_answers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 5508 bytes
SHA-256: fc404b5ae0cc547a1d19ea81b0795ba96da23b03620824f3c5a0cc31bd6f7362
font_01_sfnt_off000110f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 11116 bytes
SHA-256: c22536e85917e00db3e82b0d887a3301add8d6d7f49515f40f78cd4d4d40e5bb

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